Campbell SAT ARGOS Bedienungsanleitung Seite 161

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 153
18-bit ADC Input voltage range selection
Nominal full scale
sensor output
voltages
Full scale sensor
output voltages
Gain (Item 4) Attenuation
(Item 5)
Worst-case accuracy
degradation
±5 mV ±5.12 mV 100 1 ±.03%+3ppm/ºC
±10 mV ±10.24 mV 100 2 ±.05%+5ppm/ºC
±20 mV ±20.48 mV 100 4 ±.05%+5ppm/ºC
±50 mV ±51.2 mV 10 1 ±.03%+3ppm/ºC
±100 mV ±102.4 mV 10 2 ±.05%+5ppm/ºC
±200 mV ±204.8 mV 10 4 ±.05%+5ppm/ºC
±500 mV ±512 mV 1 1 0.0
±1 V ±1.024 V 1 2 ±.02%+2ppm/ºC
±2 V ±2.048 V 1 4 ±.02%+2ppm/ºC
±5 V ±5.12 V 1 10 ±.02%+2ppm/ºC
For differential 18-bit ADC other than passive bridge sensors,
do not exceed the common mode input signal voltage of 8 V. Or, simply,
the voltage between ground and either input must not exceed 8 V.
Exceeding this level will give erroneous readings.
When an analog sensor is powered up, it is common for the voltages to vary until a steady state is
achieved. The amount of time for the voltages to reach steady state depends upon the electronic
components within the circuit. Taking a measurement before the voltages have reached steady state can
make the measurements inaccurate. Therefore, it may be necessary to configure the ZENO
®
-3200 to wait
for several milliseconds for the analog circuit to reach steady state after it is powered. Line Item #17
provides the delay mechanism and should be configured according to the type of power being used for the
analog sensor as shown in the following table.
Type of Power Line Item #17 Setting
Continuous 0. No added delay is necessary.
Switched Power with Warmup
0. No added delay is required. Warmup time can provide any
amount of delay.
Excitation Voltage & Switched
Return
0 to 7 (15-millisecond delay increments). Excitation voltage and
switched return provides no delay on its own. If the
measurement is taken too quickly, the voltages will not be fully
settled. Some additional delay time may be required to delay the
measurement to ensure an accurate measurement is taken. The
delay can be set up to 95 milliseconds. Typical values are 2 or 3
(30 or 45 millisecond delay).
10.3.2. Digital Sensors
The ZENO
®
-3200 has several ways that it can measure a digital signal:
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